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Ok, im gunna try and make some fibreglass chest armour and I am using clay to make the model, im then going to use plaster to make the cast...but im going to finish modeling all the amrour...this is what I have done so far...what do you think?

If you're going to be pulling in fiberglass you should use silicone to make the mold, then either plaster or fiberglass to make the mold boot.
If you were to vacuum form then the plaster would be an a ok idea.